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LoJack
LoJack is a popular aftermarket car alarm, installed in some cars, that allows them to be tracked after being stolen. The name "LoJack" is a play on the word Hijack, meaning to seize, especially a vehicle, through force.
How it works
It's a small device hidden within the vehicle. The vehicle is then registered with the police. When the car is reported stolen, LoJack works with local law enforcement to track the car and recover it.
Upon receiving the stolen vehicle report, police activate transmitters that send a signal to the car's LoJack device, activating it. The LoJack device then continually sends out a uniquely coded, silent radio wave transmission; the transmission is picked up by computer/receivers in police helicopters, airplanes, and cars. The police track the transmission to the source and locate the stolen vehicle.
A 90% recovery rate is claimed by the manufacturer.
